Which is a better deal, one round pizza that is 18 inches in diameter for $15 or two round pizzas that are both 12 inches in diameter for $15?
Solution
The 18 inch diameter pizza is a better deal. The area of a circle can be found by the formula A=pi x radius x radius. The area of the top of the 18 inch diameter pizza is about 254 square inches. The area of the top of one 12 inch diameter pizza is about 113 square inches so two of them would have a top area of about 226 square inches.
(Which one would be a better deal if you wanted more crust?)
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